content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.common.internal.functions;
  
  import static org.junit.Assert.*;
  
  import java.lang.reflect.Method;
  import java.util.List;
  
  import org.junit.Test;
  
  import io.reactivex.common.*;
  import io.reactivex.common.exceptions.TestException;
  import io.reactivex.common.functions.*;
  import io.reactivex.common.internal.functions.Functions.*;
  import io.reactivex.common.internal.utils.ExceptionHelper;
  
  public class FunctionsTest {
      @Test
      public void utilityClass() {
          TestCommonHelper.checkUtilityClass(Functions.class);
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void hashSetCallableEnum() {
          // inlined TestHelper.checkEnum due to access restrictions
          try {
              Method m = Functions.HashSetCallable.class.getMethod("values");
              m.setAccessible(true);
              Method e = Functions.HashSetCallable.class.getMethod("valueOf", String.class);
              m.setAccessible(true);
  
              for (Enum<HashSetCallable> o : (Enum<HashSetCallable>[])m.invoke(null)) {
                  assertSame(o, e.invoke(null, o.name()));
              }
  
          } catch (Throwable ex) {
              throw ExceptionHelper.wrapOrThrow(ex);
          }
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void naturalComparatorEnum() {
          // inlined TestHelper.checkEnum due to access restrictions
          try {
              Method m = Functions.NaturalComparator.class.getMethod("values");
              m.setAccessible(true);
              Method e = Functions.NaturalComparator.class.getMethod("valueOf", String.class);
              m.setAccessible(true);
  
              for (Enum<NaturalComparator> o : (Enum<NaturalComparator>[])m.invoke(null)) {
                  assertSame(o, e.invoke(null, o.name()));
              }
  
          } catch (Throwable ex) {
              throw ExceptionHelper.wrapOrThrow(ex);
          }
      }
  
      @Test
      public void booleanSupplierPredicateReverse() throws Exception {
          BooleanSupplier s = new BooleanSupplier() {
              @Override
              public boolean getAsBoolean() throws Exception {
                  return false;
              }
          };
  
          assertTrue(Functions.predicateReverseFor(s).test(1));
  
          s = new BooleanSupplier() {
              @Override
              public boolean getAsBoolean() throws Exception {
                  return true;
              }
          };
  
          assertFalse(Functions.predicateReverseFor(s).test(1));
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void toFunction2() throws Exception {
          Functions.toFunction(new BiFunction<Integer, Integer, Integer>() {
              @Override
              public Integer apply(Integer t1, Integer t2) throws Exception {
                  return null;
              }
          }).apply(new Object[20]);
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void toFunction3() throws Exception {
          Functions.toFunction(new Function3<Integer, Integer, Integer, Integer>() {
              @Override
              public Integer apply(Integer t1, Integer t2, Integer t3) throws Exception {
                  return null;
              }
          }).apply(new Object[20]);
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void toFunction4() throws Exception {
          Functions.toFunction(new Function4<Integer, Integer, Integer, Integer, Integer>() {
              @Override
              public Integer apply(Integer t1, Integer t2, Integer t3, Integer t4) throws Exception {
                  return null;
              }
          }).apply(new Object[20]);
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void toFunction5() throws Exception {
          Functions.toFunction(new Function5<Integer, Integer, Integer, Integer, Integer, Integer>() {
              @Override
              public Integer apply(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5) throws Exception {
                  return null;
              }
          }).apply(new Object[20]);
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void toFunction6() throws Exception {
          Functions.toFunction(new Function6<Integer, Integer, Integer, Integer, Integer, Integer, Integer>() {
              @Override
              public Integer apply(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6) throws Exception {
                  return null;
              }
          }).apply(new Object[20]);
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void toFunction7() throws Exception {
          Functions.toFunction(new Function7<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer>() {
              @Override
              public Integer apply(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6, Integer t7) throws Exception {
                  return null;
              }
          }).apply(new Object[20]);
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void toFunction8() throws Exception {
          Functions.toFunction(new Function8<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer>() {
              @Override
              public Integer apply(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6, Integer t7, Integer t8) throws Exception {
                  return null;
              }
          }).apply(new Object[20]);
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void toFunction9() throws Exception {
          Functions.toFunction(new Function9<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer>() {
              @Override
              public Integer apply(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6, Integer t7, Integer t8, Integer t9) throws Exception {
                  return null;
              }
          }).apply(new Object[20]);
      }
  
      @SuppressWarnings({"unchecked", "rawtypes"})
      @Test(expected = NullPointerException.class)
      public void biFunctionFail() throws Exception {
          BiFunction biFunction = null;
          Functions.toFunction(biFunction);
      }
  
      @SuppressWarnings({"unchecked", "rawtypes"})
      @Test(expected = NullPointerException.class)
      public void function3Fail() throws Exception {
          Function3 function3 = null;
          Functions.toFunction(function3);
      }
  
      @SuppressWarnings({"unchecked", "rawtypes"})
      @Test(expected = NullPointerException.class)
      public void function4Fail() throws Exception {
          Function4 function4 = null;
          Functions.toFunction(function4);
      }
  
      @SuppressWarnings({"unchecked", "rawtypes"})
      @Test(expected = NullPointerException.class)
      public void function5Fail() throws Exception {
          Function5 function5 = null;
          Functions.toFunction(function5);
      }
  
      @SuppressWarnings({"unchecked", "rawtypes"})
      @Test(expected = NullPointerException.class)
      public void function6Fail() throws Exception {
          Function6 function6 = null;
          Functions.toFunction(function6);
      }
  
      @SuppressWarnings({"unchecked", "rawtypes"})
      @Test(expected = NullPointerException.class)
      public void function7Fail() throws Exception {
          Function7 function7 = null;
          Functions.toFunction(function7);
      }
  
      @SuppressWarnings({"unchecked", "rawtypes"})
      @Test(expected = NullPointerException.class)
      public void function8Fail() throws Exception {
          Function8 function8 = null;
          Functions.toFunction(function8);
      }
  
      @SuppressWarnings({"unchecked", "rawtypes"})
      @Test(expected = NullPointerException.class)
      public void function9Fail() throws Exception {
          Function9 function9 = null;
          Functions.toFunction(function9);
      }
  
      @Test
      public void identityFunctionToString() {
          assertEquals("IdentityFunction", Functions.identity().toString());
      }
  
      @Test
      public void emptyActionToString() {
          assertEquals("EmptyAction", Functions.EMPTY_ACTION.toString());
      }
  
      @Test
      public void emptyRunnableToString() {
          assertEquals("EmptyRunnable", Functions.EMPTY_RUNNABLE.toString());
      }
  
      @Test
      public void emptyConsumerToString() {
          assertEquals("EmptyConsumer", Functions.EMPTY_CONSUMER.toString());
      }
  
      @Test
      public void errorConsumerEmpty() throws Exception {
          List<Throwable> errors = TestCommonHelper.trackPluginErrors();
          try {
              Functions.ERROR_CONSUMER.accept(new TestException());
  
              TestCommonHelper.assertUndeliverable(errors, 0, TestException.class);
              assertEquals(errors.toString(), 1, errors.size());
          } finally {
              RxJavaCommonPlugins.reset();
          }
      }
  }
  